Page 261 - The Jet Engine

24: Maintenance

Contents Page

Introduction 251
On-wing maintenance 252

Scheduled maintenance
Unscheduled maintenance
Condition monitoring 252

Flight deck indicators
In-flight recorders
Ground indicators
Maintenance precautions 254
Trouble shooting 254

Adjustments 256

Ground testing 256

INTRODUCTION 3. The comprehensive instructions covering the
actual work to be done to support scheduled
1. Maintenance covers both the work that is maintenance (para. 8) and unscheduled maintenance
required to maintain the engine and its systems in an (para. 10) are contained in the aircraft maintenance
airworthy condition while installed in an aircraft (on- manual. Both this publication, and the aircraft
wing or line maintenance) and the work required to maintenance schedule mentioned in para. 8, are
return the engine to airworthy condition when based on manufacturers' recommendations and are
removed from an aircraft (overhaul or shop approved by the appropriate airworthiness authority.
maintenance). On-wing maintenance is covered in
this Part; overhaul is covered in Part 25. 4. The maximum time an engine can remain
installed in an aircraft (engine life) is limited to a fixed
2. Because many aspects of maintenance are period agreed between the engine manufacturer and
subject to the approval of a recognized authority, it airworthiness authority. On some engines this period
should be fully understood that the information given is referred to as the time between overhaul (T.B.O.)
in this Part is of a general nature and is not intended and on reaching it the engine is removed for
as a substitute for any official instructions. complete overhaul.

251